drm/msm/sde: Correct args while calling setup_blendstage

The sde_hw_ctl_setup_blendstage function was called with
wrong input args which resulted in wrong mixer and CTL
settings. WB timeout and PP timeout were seen as a
side effect of this during WFD tear down. Correct the
arguments to resolve this.

Change-Id: I12ff35058f0baccfc27670169fe023a4b5fc18ad
Signed-off-by: Nirmal Abraham <nabrah@codeaurora.org>